New opportunities for statistics collection in Teradata 14.0 - comment by carrie

Raja,
 
Fresh statistics are always the best.  But extrapolation capabilities, particularly in releases 14.0 and above, can provide some relief for sites that simply do not have the time or the resources to recollect everything to a high standard of freshness. 
 
When data distribution is relatively uniform extrapolation can offer reasonably accurate estimates, as long as you recollect SUMMARY statistics on the table frequently.
 
In 14.0 and above you can see what the extrapolated statistics will look like by issuing this command:
 
          HELP CURRENT STATISTICS ON MyTable;
 
Sampling is another technique you can use to save resources, but prior to 14.10 you want to be careful not to rely on sampling too heavily for very skewed columns.
 
Thanks, -Carrie